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<?php
/**
* Copyright 2012-2017 Horde LLC (http://www.horde.org/)
*
* See the enclosed file LICENSE for license information (LGPL). If you
* did not receive this file, see http://www.horde.org/licenses/lgpl21.
*
* @category Horde
* @copyright 2012-2017 Horde LLC
* @license http://www.horde.org/licenses/lgpl21 LGPL 2.1
* @package Mime
*/
/**
* This class parses a multipart/related MIME part (RFC 2387) to provide
* information on the part contents.
*
* @author Michael Slusarz <slusarz@horde.org>
* @category Horde
* @copyright 2012-2017 Horde LLC
* @license http://www.horde.org/licenses/lgpl21 LGPL 2.1
* @package Mime
*/
class Horde_Mime_Related implements IteratorAggregate
{
/**
* Content IDs.
*
* @var array
*/
protected $_cids = array();
/**
* Start ID.
*
* @var string
*/
protected $_start;
/**
* Constructor.
*
* @param Horde_Mime_Part $mime_part A MIME part object. Must be of
* type multipart/related.
*/
public function __construct(Horde_Mime_Part $mime_part)
{
if ($mime_part->getType() != 'multipart/related') {
throw new InvalidArgumentException('MIME part must be of type multipart/related');
}
$id = null;
$ids = array();
$related_id = $mime_part->getMimeId();
/* Build a list of parts -> CIDs. */
foreach ($mime_part->partIterator() as $val) {
$part_id = $val->getMimeId();
$ids[] = $part_id;
if ((strcmp($related_id, $part_id) !== 0) &&
($cid = $val->getContentId())) {
$this->_cids[$part_id] = $cid;
}
}
/* Look at the 'start' parameter to determine which part to start
* with. If no 'start' parameter, use the first part (RFC 2387
* [3.1]). */
if ($start = $mime_part->getContentTypeParameter('start')) {
$id = $this->cidSearch(trim($start, '<> '));
}
if (empty($id)) {
reset($ids);
$id = next($ids);
}
$this->_start = $id;
}
/**
* Return the start ID.
*
* @return string The start ID.
*/
public function startId()
{
return $this->_start;
}
/**
* Search for a CID in the related part.
*
* @param string $cid The CID to search for.
*
* @return string The MIME ID or false if not found.
*/
public function cidSearch($cid)
{
return array_search($cid, $this->_cids);
}
/**
* Scan for CID strings in HTML data and replace with data returned from
* a callback method.
*
* @param mixed $text The HTML text (can be Horde_Domhtml object).
* @param callback $callback Callback method. Receives three arguments:
* MIME ID, the attribute name containing the
* content ID, and the node object. Expects
* return value of URL to display the data.
* @param string $charset HTML data charset.
*
* @return Horde_Domhtml A Horde_Domhtml object.
*/
public function cidReplace($text, $callback, $charset = 'UTF-8')
{
$dom = ($text instanceof Horde_Domhtml)
? $text
: new Horde_Domhtml($text, $charset);
foreach ($dom as $node) {
if ($node instanceof DOMElement) {
switch (Horde_String::lower($node->tagName)) {
case 'body':
case 'td':
$this->_cidReplace($node, 'background', $callback);
break;
case 'img':
$this->_cidReplace($node, 'src', $callback);
break;
}
}
}
return $dom;
}
/**
*/
protected function _cidReplace($node, $attribute, $callback)
{
if ($node->hasAttribute($attribute)) {
$val = $node->getAttribute($attribute);
if ((strpos($val, 'cid:') === 0) &&
($id = $this->cidSearch(substr($val, 4)))) {
$node->setAttribute($attribute, call_user_func($callback, $id, $attribute, $node));
}
}
}
/* IteratorAggregate method. */
public function getIterator()
{
return new ArrayIterator($this->_cids);
}
}